When I wrote before about writing to Intel, I had considered only part of the issue. So I feel obligated to fill in the part of the picture that was missing.
The messages you send to Intel's customer service in favor of free BIOS support are not read or answered by someone who has the authority to change Intel's policy. That's the part I considered before.
The part I overlooked is that these messages are part of a campaign. Sending many letters to Intel has the effect of showing Intel that the public is concerned about the issue. So even if the people who read these messages only send back a canned response, they tell people higher up that the public is concerned about the issue. More letters mean more pressure.
So it is useful to send the messages.